Diff: RTCClockHR.h

Revision:

7:bfd32470c0bc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/RTCClockHR.h	Sun Sep 23 02:30:32 2018 -0400
@@ -0,0 +1,78 @@
+/*
+ * RTCClockHR.h
+ *
+ *  Created on: Sep 23, 2018
+ *      Author: caoyu
+ */
+
+#ifndef RTCCLOCKHR_H_
+#define RTCCLOCKHR_H_
+
+#include "mbed.h"
+#include "RTCClock.h"
+#include "mbed_mktime.h"
+#include "rtc_api_hal.h"
+
+class RTCClockHR: public RTCClock {
+public:
+	RTCClockHR(){
+	}
+	virtual ~RTCClockHR(){
+	}
+
+	virtual double getTimeHighResolution() {
+		struct tm timeinfo;
+
+		/* Since the shadow registers are bypassed we have to read the time twice and compare them until both times are the same */
+		uint32_t Read_time = RTC->TR & RTC_TR_RESERVED_MASK;
+		uint32_t Read_date = RTC->DR & RTC_DR_RESERVED_MASK;
+		uint32_t Read_ss = RTC->SSR & (0xFFFF);
+
+		while ((Read_ss != (RTC->SSR & 0xFFFF))
+				|| (Read_time != (RTC->TR & RTC_TR_RESERVED_MASK))
+				|| (Read_date != (RTC->DR & RTC_DR_RESERVED_MASK))) {
+			Read_ss = RTC->SSR & 0xFFFF;
+			Read_time = RTC->TR & RTC_TR_RESERVED_MASK;
+			Read_date = RTC->DR & RTC_DR_RESERVED_MASK;
+		}
+
+		/* Setup a tm structure based on the RTC
+		 struct tm :
+		 tm_sec      seconds after the minute 0-61
+		 tm_min      minutes after the hour 0-59
+		 tm_hour     hours since midnight 0-23
+		 tm_mday     day of the month 1-31
+		 tm_mon      months since January 0-11
+		 tm_year     years since 1900
+		 tm_yday     information is ignored by _rtc_maketime
+		 tm_wday     information is ignored by _rtc_maketime
+		 tm_isdst    information is ignored by _rtc_maketime
+		 */
+		timeinfo.tm_mday = RTC_Bcd2ToByte(
+				(uint8_t) (Read_date & (RTC_DR_DT | RTC_DR_DU)));
+		timeinfo.tm_mon = RTC_Bcd2ToByte(
+				(uint8_t) ((Read_date & (RTC_DR_MT | RTC_DR_MU)) >> 8)) - 1;
+		timeinfo.tm_year = RTC_Bcd2ToByte(
+				(uint8_t) ((Read_date & (RTC_DR_YT | RTC_DR_YU)) >> 16)) + 68;
+		timeinfo.tm_hour = RTC_Bcd2ToByte(
+				(uint8_t) ((Read_time & (RTC_TR_HT | RTC_TR_HU)) >> 16));
+		timeinfo.tm_min = RTC_Bcd2ToByte(
+				(uint8_t) ((Read_time & (RTC_TR_MNT | RTC_TR_MNU)) >> 8));
+		timeinfo.tm_sec = RTC_Bcd2ToByte(
+				(uint8_t) ((Read_time & (RTC_TR_ST | RTC_TR_SU)) >> 0));
+
+		// Convert to timestamp
+		time_t t;
+		if (_rtc_maketime(&timeinfo, &t, RTC_4_YEAR_LEAP_YEAR_SUPPORT) == false) {
+			return 0;
+		}
+
+		// Add fractional part
+		double thr = (double) t
+				+ (double) (PREDIV_S_VALUE - Read_ss) / (PREDIV_S_VALUE + 1);
+
+		return thr;
+	}
+};
+
+#endif /* RTCCLOCKHR_H_ */